>>177

まず、親フォームにタイマーを追加する
親フォームのタイマーの参照を、子フォームの WithEvents に代入する

親側

Private child As Form2

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
child = New Form2
child.Timer1 = Me.Timer1
Me.Timer1.Interval = 2000
Me.Timer1.Enabled = True
child.MdiParent = Me
child.Show()
End Sub

子側

Friend WithEvents Timer1 As System.Windows.Forms.Timer

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
MsgBox("child timer events")
End Sub