[VB.NET]为ToolStrip动态加入的按钮怎么写点击事件？

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为ToolStrip动态加入的按钮怎么写点击事件？
ToolStrip1.Items.Add( "a ")
ToolStrip1.Items.Add( "b ")
ToolStrip1.Items.Add( "c ")
ToolStrip1.Items.Add( "d ")
用以上方法可以在ToolStrip1中加入一些按钮，但怎么把点按钮的代码写进去呢？
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ToolStrip1_ItemClicked里写:
If e.ClickedItem.Text = "a " Then
MsgBox( "a ")
ElseIf e.ClickedItem.Text = "b " Then
MsgBox( "b ")
End If
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搞定
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