simple binding problem

I have a rather simple problem, but I am unable to get my head around it... I have a class that inherits from UserControl. It has an AxisColor DependencyProperty of type Color. In the XAML structure of the class I have <ms3DTools:ScreenSpaceLines3D Thickness="2" Points="0,0,0 10开发者_JS百科0,0,0" Color="{Binding Mode=OneWay, Path=AxisColor}". The binding does not work. What am I doing wrong?

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If you have a UserControl that needs to get a Property AxisColor from a class, you need to set your DataContext of that UserControl to the class that contains AxisColor.

myUserControl.DataContext = myClassInstance;

Otherwise, your user control does not know where to grab the property from.

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You probably want to add RelativeSource={RelativeSource Self} to the binding expression. Otherwise, you are binding to the DataContext property.

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If you want UI binding then you have to specify ElementName, more options here. If you want data binding then make sure you have DataContext set up correctly.