Detect drop from toolbox

3 posts, 0 answers
  1. Valentino
    Valentino avatar
    28 posts
    Member since:
    Aug 2017

    Posted 24 Aug 2017 Link to this post

    What is the best way to react to a shape being drag-dropped onto the diagram from the toolbox? At the moment I'm subscribing to the ItemsChanged event but I'm sure there must be a better way? I'm also doing things with drag-drop (shapes within the diagram) but this doesn't seem to relate to the toolbox.
  2. Tino
    Tino avatar
    86 posts
    Member since:
    Jul 2017

    Posted 31 Aug 2017 in reply to Valentino Link to this post

    ok, I had seen DragDropService_PreviewDragDrop earlier but somehow forgot about it.

    Anyway, I've implemented it but mu dropTarget.Shapes collection is always empty.. Why would that be.

    I'll probably lodge a ticket now that I have been assigned a login.

  3. Dimitar
    Dimitar avatar
    2984 posts

    Posted 04 Sep 2017 Link to this post

    Hello Valentino,

    You can use the following code to get the diagram in the PreviewDragDrop event handler:
    public RadForm1()
        radDiagramToolbox1.ListViewElement.DragDropService.PreviewDragDrop += DragDropService_PreviewDragDrop;
    void DragDropService_PreviewDragDrop(object sender, Telerik.WinControls.RadDropEventArgs e)
        var diagramElement = e.HitTarget as RadDiagramElement;
        if (diagramElement != null)

    I hope this will be useful. Let me know if you have additional questions.

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