Ответ BlueRaja - это ответ, вы можете сделать это несколькими способами, вот два:
Во-первых:
Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
ToolStripButton2.Checked = ToolStripButton1.Checked
'Do whatever you want with your buttons
End Sub
Private Sub ToolStripButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click
ToolStripButton1.Checked = ToolStripButton2.Checked
'Do whatever you want with your buttons
End Sub
Другой подход:
Private Sub ToolStripButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.Click
'Do whatever you want with your buttons
End Sub
Private Sub ToolStripButton2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.Click
'Do whatever you want with your buttons
End Sub
Private Sub ToolStripButton1_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton1.CheckedChanged
ToolStripButton2.Checked = ToolStripButton1.Checked
End Sub
Private Sub ToolStripButton2_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ToolStripButton2.CheckedChanged
ToolStripButton1.Checked = ToolStripButton2.Checked
End Sub
Я предпочитаю первый, очевидно.