I wanted to provide the users the possibility of editing the arrow names, but arrows don't have the .BeginInplaceEdit of boxes, so I thought about opening a window with the arrow reference when the user double-clicks on it, change the text (and possibly some other arrow properties) in the form and then update the Flowchart with the supplied arrow reference.

The code is as follows:

    Private Sub AxFlowChart1_ArrowDblClicked(ByVal sender As Object, ByVal e As AxFLOWCHARTLib._IFlowChartEvents_ArrowDblClickedEvent) Handles AxFlowChart1.ArrowDblClicked
        'Open Arrow edition screen
       Dim ArrForm As New ArrowForm
       ArrForm.MdiParent = Main
       ArrowForm.ArrowLine = Me.AxFlowChart1.ActiveArrow
       ArrForm.Show()
    End Sub

This is supposed to pass the reference to a variable declared as:

    Public ArrowLine As FLOWCHARTLib.arrow

The text is then supposed to change with the following event:

    Private Sub txtName_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtName.TextChanged
       If Not (ArrowLine Is Nothing) Then
           ArrowLine.Text = txtName.Text
       End If
    End Sub

However, the "ArrowLine" is always nothing, so the reference is apparently not passed to the other form.

What am I doing wrong?

Hello, Stoyan

Thank you for the response, but it does not work either. It did not work either when I tried to pass the arrow reference using ".Findarrow" and the tag ID. For some mysterious reason I am unable to pass on an arrow reference from the Diagram form to the form that has to edit the arrow data.

However, if I make the call the other way round, i.e., from the "child" form ArrForm that has to edit the arrow data using ".Findarrow" then it DOES work:

               ArrowLine = Main.CurrentDiagram.AxFlowChart1.FindArrow(m_ArrowId)


It has me left totally mystified.... given that with this latter solution I have been able to find a workaround it's OK, but if you find where the problem is in my code I'd like to hear about it...

Thanks for your help.

There is only one diagram, I am not trying to send arrows between different diagrams or display it in different forms.

"Arrowform" is simply a new form so as to be able to edit the arrow name, as I cannot do it on the diagram itself. It does not contain a diagram of its own.

"Arrowline" is supposed to be simply a reference to the arrow so that when I update the name of the arrow in the Arrowform  form I can call back the original diagram in the original form (using Arrowline.Text) and update directly the corresponding arrow.

Eventually I got the workaround to get a reference to the corresponding arrow using:

ArrowLine = Main.CurrentDiagram.AxFlowChart1.FindArrow(m_ArrowId)

This allows me to change the arrow name in the original diagram while I am still editing the name in the Arrform arrow name editing form.

What surprises me is that I cannot pass the object from the original form TO the arrow editing form for the callback, but I CAN get the callback reference FROM the arrow editing form.... very mysterious....
???

Thank you anyhow for your help

Ooops... now that was a really stupid mistake...

In any case it has demonstrated (again) that your customer service is first-class.

Thank you very much, Stoyo!