I have mdiForm1 and Form1 as child
In Form1 I have a Menu mnuClear
Sure you can call this menu from mdiForm (button in PictureBox)
This procedure deletes the values of local variables and they can not put in the module as Public Sub
Form1 is a document that can be opened with the command New. So I variables dimensioned in Form1 and not in a module as Public. If they were Public then they would be the same value in all open Form1 ...