Why binding to MinWidth doesn't work?

Question

In my application I created templated control. Now I want to bind MinWidth to dependency property. For example in my xaml I have

<ColumnDefinition  Width="Auto" MinWidth="{TemplateBinding ColumnWidth}"/>

and in my code

public double ColumnWidth
{
    get { return (double)GetValue(ColumnWidthProperty); }
    set { SetValue(ColumnWidthProperty, value); }
}

public static readonly DependencyProperty ColumnWidthProperty =
    DependencyProperty.Register(
        "ColumnWidth", typeof(double), typeof(Schedule), new PropertyMetadata(200));

Unfortunately, it doesn't work and I dont know why. MinWidth is always 0. Maybe someone knows what I'm doing wrong ?

Answer 1

I don't know why the TemplateBinding won't work in your case, but you could always replace it by a regular Binding like this:

<ColumnDefinition MinWidth="{Binding ColumnWidth,
                             RelativeSource={RelativeSource Mode=TemplatedParent}}"/>

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I've tested this in a ControlTemplate of a custom control. TemplateBinding doesn't work, Binding does.