如何在设计模式下在上下文菜单中插入/删除WPF网格行/列？

<Grid>
    <Grid.ContextMenu>
       <ContextMenu>
           <MenuItem Header="插入行" Click="InsertRow_Click"/>
           <MenuItem Header="删除行" Click="DeleteRow_Click"/>
           <MenuItem Header="插入列" Click="InsertColumn_Click"/>
           <MenuItem Header="删除列" Click="DeleteColumn_Click"/>
        </ContextMenu>
    </Grid.ContextMenu>
</Grid>

private void InsertRow_Click(object sender, RoutedEventArgs e)
{
    // 在Grid控件中插入一行
    RowDefinition rowDef = new RowDefinition();
    grid.RowDefinitions.Add(rowDef);
}

private void DeleteRow_Click(object sender, RoutedEventArgs e)
{
    // 删除Grid控件中的最后一行
    if (grid.RowDefinitions.Count > 0)
    {
        grid.RowDefinitions.RemoveAt(grid.RowDefinitions.Count - 1);
    }
}

private void InsertColumn_Click(object sender, RoutedEventArgs e)
{
    // 在Grid控件中插入一列
    ColumnDefinition colDef = new ColumnDefinition();
    grid.ColumnDefinitions.Add(colDef);
}

private void DeleteColumn_Click(object sender, RoutedEventArgs e)
{
    // 删除Grid控件中的最后一列
    if (grid.ColumnDefinitions.Count > 0)
    {
        grid.ColumnDefinitions.RemoveAt(grid.ColumnDefinitions.Count - 1);
    }
}