DragDropManager events and KeyStates

[Dmitry]

As I can see during debug, Telerik.Windows.DragDrop.DragEventArgs has a private field eventArgs which has a field KeyStates. But since Telerik DragEventsArgs hide eventArgs I cannot access KeyStates property.
How am I supposed to figure out if any modifier keys were pressed at the moment of any DragDropManager's events?

[Polya]

Hello Dmitry,

In order to get the KeyStates we need to add handler to QueryContinueDrag. There the event arguments available are of type Telerik.Windows.DragDrop.QueryContinueDragEventArgs which contain the DragDropKeyStates desired. More information about the drag source events and how to hook to them can be found here.
You can try something like this in your code:

public MainWindow()
{
    InitializeComponent();
    DragDropManager.AddQueryContinueDragHandler(this.listBox, OnQueryContinueHandler);
}

private void OnQueryContinueHandler(object sender, Telerik.Windows.DragDrop.QueryContinueDragEventArgs e)
{
    if (e.KeyStates == DragDropKeyStates.ShiftKey)
    {
        //insert logic here.
    }
}

Hopefully this helps.

Regards,
Polya
Telerik