I am using this code to change a textbox text but nothing happens i am using it in textbox lost focus event ..

If Me.ToolStripDropDownButton1.Image Is My.Resources.ask_icon Then
Me.ToolStripTextBox1.Text = "Search ask"
ElseIf Me.ToolStripDropDownButton1.Image Is My.Resources.YahooIcon Then
Me.ToolStripTextBox1.Text = "Search yahoo"
ElseIf Me.ToolStripDropDownButton1.Image Is My.Resources.google_54 Then
Me.ToolStripTextBox1.Text = "Search google"
End If