Change Template from Codebehind

[ezazazel]

Hi guys! Can anyone pleas help me with this:

<Grid ShowGridLines="True">
<ItemsControl Loaded="LoadedItemsControl"
ItemContainerStyleSelector="{StaticResource MElementStyleSelector}"
ItemsSource="{Binding Source={StaticResource MElements}}" x:Name="i1">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<Grid ShowGridLines="True">

//HERE SHOULD BE THE ROW AND COLUMNDEFINITIONS
</Grid>
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>

As you can see in the code block I do have a ItemsTemplate with a Grid. What I need to do is to add Row- and Column definitions from Code behind, or if possible bind the needed amount in some way. The problem is, I have a huge number of cols and rows and I really do not want to write them line by line. In a normal Grid I would do it this way:

private void SetRowColDefinitions(int columns, int rows)
{
for (int i = 0; i < rows; i++)
{
RowDefinition row = new RowDefinition();
row.MinHeight = 50;
MGrid.RowDefinitions.Add(row);
}

        for (int i = 0; i < columns; i++)
        {
            ColumnDefinition col = new ColumnDefinition();
            col.MinWidth = 50;
            MGrid.ColumnDefinitions.Add(col);
        }
    }

Unfortunately I cannot address the Grid in the Template. As always, help would be really appreciated!

[Hauke Wittern]

You can use the Initialized or Loaded event on the Grid which is your ItemsPanel:

<ItemsControl>
      <ItemsControl.ItemsPanel>
            <ItemsPanelTemplate>
                  <Grid ShowGridLines="True"
                           Initialized="Grid_Initialized">
                  </Grid>
            </ItemsPanelTemplate>
      </ItemsControl.ItemsPanel>
</ItemsControl>

private void Grid_Initialized(object sender, EventArgs e)
{
      var itemsGrid = (Grid)sender;

AddColumn(itemsGrid);
      AddColumn(itemsGrid);
      AddColumn(itemsGrid);
}

private static void AddColumn(Grid itemsGrid)
{
      var column1 = new ColumnDefinition()
      {
            Width = new GridLength(100, GridUnitType.Pixel)
      };
      itemsGrid.ColumnDefinitions.Add(column1);
}

[ezazazel]

Thank you very much! Helps me a lot!