I have a wpf wpplication with a number of user controls in it. One of these controls has a property called ButtonsEnabled. This is a bool DependencyProperty in the user control. The property is bound to the IsEnabled property of a couple of buttons on that control.
This user control is used in the MainWindow. The MainWindow has a couple of view model objects in it called EocMonitor and ComMonitor. These both descend from an abstract base class that implements INotifyPropertyChanged. The ButtonsEnabled property on the UserControl is bound to the Status property using a multibinding and a class that implements IMultiConverter that I wrote.
The problem is that even though the PropertyChanged event is being raised when the Status property changes, the IMultiConverter is not being called after it is initially called, so the value of the ButtonsEnabled property is not changing. As a result, the buttons are not enabling.
What do I need to do to make this work?
I did an end-run around this problem as I am running out of time before we reach our code-freeze for this release. What I did was I added a ButtonsEnabled DepdendencyProperty to the MainWindow class and bound it to the user control's ButtonsEnabled property. I then added a PropertyChanged event handler in the MainWindow and and registered it with the DbMonitor and ComMonitor objects when they were created. I then wrote code in the PropertyChanged event handler to set the MainWindow's ButtonsEnabled properly.
Everything works and I'll worry about making the other approach work at some later time. Maybe.