Property changed event is not called when the DataBinding mode is set to OneWay

Hi There

I have 2 dependency properties on the custom control and defined like here:

public static readonly DependencyProperty  SplitterWidthProperty =
            DependencyProperty.Register("SplitterWidth",
                                        typeof (double),
                                        typeof (SplitContainer),
                                        new FrameworkPropertyMetadata(5.0,
                                                                      FrameworkPropertyMetadataOptions.AffectsMeasure |
                                                                      FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                                                                      SplitterWidth_Changed));

and another one

public static readonly DependencyProperty Child1CollapsedProperty =
            DependencyProperty.Register("Child1Collapsed",
                                        typeof (bool),
                                        typeof (SplitContainer),
                                        new FrameworkPropertyMetadata(false,
                                                                      FrameworkPropertyMetadataOptions.AffectsMeasure|
                                                                      FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
                                                                      ChildCollapsed_Changed));

We bind these 2 properties with binding mode=OneWay. But when the Child1CollapsedProperty in the view model is changed, the function Child1Collapsed_Changed will be called.

Bbut when SplitterWidthPropery in the view model is changed the function SplitterWidth_Changed will not be called, (of course, the SplitterWidth is not set to new value) unless the databinding mode = TwoWay, or don't set (default is TwoWay according to definition).

I have no idea how to fix them. Please help!!!

Thanks

Gordon

Gordon Senior Software Developper