Vb. NET Octopus Brother Production-How to troubleshoot an MDI child window that is covered by a control in the parent window

Recently, a netizen asked me this question, I went online search, the results are very disappointed. There are several help posts on the csdn. There was no clear answer at the end of the view.

Here I found on the Internet API function SetParent (), and the online error has been changed, and gave a simple example code.

Readers can test themselves:

Public Class Form1    ' octopus brother, qq:3107073263 Group: 309816713          ' If you have any questions or good suggestions please contact me. Everybody progress together     ' Declare the SetParent function.  This is an API function    Declare functions SetParent Lib "user32" Alias "SetParent" (ByVal hwndchild as INTPTR, ByVal hwndnewparent as INTPTR) as Long    Private Sub Form1_Load (ByVal sender as System.Object, ByVal e as System.EventArgs) Handles Mybase.loa D        me.ismdicontainer = True ' Sets Form1 to the parent window container    End sub    Private Sub button1_click (ByVal sender as System.Object, ByVal e as System.EventArgs) Handles Button1.Click        ' Form1 is the parent window, Form2 is a child window        SetParent (Form2.handle, Me.handle)        form2.show ()    End Sub    Private Sub button2_click (ByVal sender as System.Object, ByVal e as System.EventArgs) Handles button2.click
   setparent (Form3.handle, Me.handle)        form3.show ()    End subend Class

Effect:

Vb. NET Octopus Brother Production-How to troubleshoot an MDI child window that is covered by a control in the parent window