I'm trying to create a Sheet generator in Revit, using Pyrevit Add in.

So by using Ironpython and WPF, I managed to create a datagrid with multiple combobox columns.

However, for the tool to be efficient, I want it to be able to select multiple rows and then with a change in one combo box, it applies that value to all the combo boxes down the column.

I tried setting the value in my python code.... I'm getting the print statements, but the values don't reflect/update in the datagrid.

Here's my code

class SheetData(object):  
    def __init__(self, sheet_name, sheet_number, levels, scope_boxes, view_types, view_templates):
        self.SheetName = str(sheet_name)   
        self.SheetNumber = str(sheet_number)
        self.Levels = levels
        self.ScopeBoxes = list(scope_boxes) if scope_boxes else ["None"]
        self.ViewTypes = view_types
        self.ViewTemplates = list(view_templates.keys()) if view_templates else ["None"]

        # Assign default values safely
        self.SelectedLevel = self.get_best_matching_level() or self.Levels[0]
        self.SelectedScopeBox = self.ScopeBoxes[0]
        self.SelectedViewType = ""
        self.SelectedViewTemplate = self.ViewTemplates[0]

    def get_best_matching_level(self):
        if not self.Levels:
            return None

        sheet_lower = self.SheetName.lower()
        for level in self.Levels:
            if any(word in sheet_lower for word in level.lower().split()):  
                return level  # Return the first matching level
        
        return None  # No match found

    
class SheetListWindow(Window):
    def __init__(self, sheet_names, sheet_numbers, levels, scope_boxes, view_types, view_templates):
        xamlfile = script.get_bundle_file('ui2.xaml')
        wpf.LoadComponent(self, xamlfile)

        temp_list = List[SheetData]() 
        for name, number in zip(sheet_names, sheet_numbers):
                    temp_list.Add(SheetData(name, number, levels, scope_boxes, view_types, view_templates))

        self.sheet_data_list = ObservableCollection[SheetData](temp_list)
        self.sheets_lb.ItemsSource = self.sheet_data_list


    @property
    def selected_sheets(self):
        return self.sheets_lb.SelectedItems
    
    def ComboBox_SelectionChanged(self, sender, e):
        # Temporarily disconnect event handler
        sender.SelectionChanged -= self.ComboBox_SelectionChanged

        selected_item = sender.SelectedItem
        if selected_item:
            print("New View Type Selected: {}".format(selected_item))

            for sheet in self.selected_sheets:
                if sheet.SelectedViewType != selected_item:  # Prevent unnecessary updates
                    sheet.SelectedViewType = selected_item
                    print("Updated Sheet: {} -> {}".format(sheet.SheetName, selected_item))

        # Reconnect event handler
        sender.SelectionChanged += self.ComboBox_SelectionChanged

And here's my XAML.

<Window xmlns="; 
        xmlns:x=";
        Title="Sheet List" Height="600" Width="1200"
        WindowStartupLocation="CenterScreen"
        Background="#f7f7f7"
        ResizeMode="CanResizeWithGrip">

    <Grid Margin="10">
        <DataGrid x:Name="sheets_lb"
                AutoGenerateColumns="False"
                Margin="10,0,10,10"
                BorderThickness="1"
                RowHeaderWidth="0"
                CanUserSortColumns="True"
                HorizontalGridLinesBrush="#dedede"
                VerticalGridLinesBrush="#dedede"
                EnableColumnVirtualization="True"
                EnableRowVirtualization="True"
                VirtualizingPanel.IsVirtualizing="True"
                VirtualizingPanel.VirtualizationMode="Recycling">

            
            <DataGrid.Columns>
                <DataGridTextColumn Header="Sheet Name"
                                    Binding="{Binding SheetName}" 
                                    MinWidth="150"/>

                <DataGridTextColumn Header="Sheet Number"
                                    Binding="{Binding SheetNumber}" 
                                    MinWidth="100"/>

                <DataGridTemplateColumn Header="Level" MinWidth="120">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding Levels}"
                                      SelectedItem="{Binding SelectedLevel, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                                      Padding="4"
                                      BorderThickness="1"
                                      BorderBrush="#ccc"
                                      Background="White"
                                      VerticalContentAlignment="Center"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

                <DataGridTemplateColumn Header="Scope Box" MinWidth="120">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding ScopeBoxes}"
                                      SelectedItem="{Binding SelectedScopeBox}"
                                      Padding="4"
                                      BorderThickness="1"
                                      BorderBrush="#ccc"
                                      Background="White"
                                      VerticalContentAlignment="Center"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

                <DataGridTemplateColumn Header="View Type" MinWidth="120">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox x:Name = "viewtype_cb" ItemsSource="{Binding ViewTypes}"
                                      SelectedItem="{Binding SelectedViewType, Mode=TwoWay}"
                                      Padding="4"
                                      BorderThickness="1"
                                      BorderBrush="#ccc"
                                      Background="White"
                                      VerticalContentAlignment="Center"
                                      SelectionChanged="ComboBox_SelectionChanged"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

                <DataGridTemplateColumn Header="View Template" MinWidth="150">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding ViewTemplates}"
                                      SelectedItem="{Binding SelectedViewTemplate}"
                                      Padding="4"
                                      BorderThickness="1"
                                      BorderBrush="#ccc"
                                      Background="White"
                                      VerticalContentAlignment="Center"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>