If I understand correctly. You want to show buttons with Text and an Image, but if the width of the button is reduced to a certain size, it will only show the image.
If so, you should be able to implement with a datatrigger.
<Window x:Class="StackOverflow1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:StackOverflow1"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:isLessThanConverter x:Key="MyisLessThanConverter"/>
<Style x:Key="myWidthTrigger" TargetType="TextBlock">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=ActualWidth, RelativeSource={RelativeSource AncestorType=Button}, Converter={StaticResource MyisLessThanConverter}, ConverterParameter=90}" Value="True">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"></ColumnDefinition>
<ColumnDefinition Width="Auto"></ColumnDefinition>
<ColumnDefinition Width="*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<ListView HorizontalContentAlignment="Stretch">
<Button x:Name="myButton" Width="Auto">
<StackPanel Orientation="Horizontal">
<TextBlock x:Name="MyTextBlock" Style="{StaticResource myWidthTrigger}" Text="Test"></TextBlock>
<Image Source="image.png" Height="15"></Image>
</StackPanel>
</Button>
</ListView>
<GridSplitter Width="5" Grid.Column="1" ResizeDirection="Columns" ResizeBehavior="PreviousAndNext"></GridSplitter>
</Grid>
Also using this IValueConvertor:
[ValueConversion(typeof(double), typeof(string))]
public class isLessThanConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if ((double)value < double.Parse((string)parameter))
{
return true;
}
else
{
return false;
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
I am not an expert at this, so there may be a cleaner way. I also used a listview instead of your requested wrappanel.
Hope this helps