call a procedure of a form from the toolbox

[escape0]

i want to use the same buttons (help, save, delete, ...) in the whole mdi-application. Depending on the form which is loaded the buttons have different functions.

Private Sub ToolBar1_ButtonClick(...) Handles ToolBar1.ButtonClick
Dim f As New Form2()

f.F1()
End Sub

F1 is a procedure of Form2... the question is: how can i call the procedure F1 of the Form which is currently loaded?

Dim f As New ???

thank you