WPF style setter not working

Question

I have a custom user control that contains a combo box. I\'ve added a ComboBoxWidth dependency property to allow developer to set width if they want. Using a style setter, I\'

Answer 1

A so-called "local value" of a dependency property, like

this.ComboBoxWidth = 175.0;

has higher value precedence than a value from a Style Setter, like

<Setter Property="ComboBoxWidth" Value="400"/>

Hence the Style Setter has no effect.

You should assign a new default value by overriding dependency property metadata:

public class AngleUserControl : ...
{
    static AngleUserControl()
    {
        ComboBoxWidthProperty.OverrideMetadata(
            typeof(AngleUserControl),
            new PropertyMetadata(175d));
    }
}

See Dependency Property Value Precedence for reference.