When using OneWay mode binding for RadSideDrawer.IsOpen property, the drawer doesn't open when changing the view model property value.

XAML Implementation

<primitives:RadSideDrawer  IsOpen="{Binding IsOpen}">


ViewModel Property Implementation:

private bool isOpen = true;
public bool IsOpen
{
     get { return isOpen; }
     set { SetProperty(ref isOpen, value); }
}



WORKAROUND:

Changing the binding to TwoWay mode will make it work, for example:  IsOpen="{Binding IsOpen, Mode=TwoWay}"