Alternate Button Macro & Caption Between 2

I have a worksheet with 2 buttons labelled "Hide" and "Show". As the names imply, they allow the user to hide or show parts of the worksheet. I would like to combine them into one button and have the button label and the associated macro change with each press of the button. Here is what I have so far;

Sub SHOW_LEADS()
Rows("10:15").Select
Selection.EntireRow.Hidden = False
ActiveSheet.Shapes("Button 20").Select
Selection.Characters.Text = "HIDE LEADS"
Range("A1").Select 'is there a better way to remove the focus from the button than selecting a cell off the button?
End Sub

Sub HIDE_LEADS()
Rows("10:14").Select
Selection.EntireRow.Hidden = True
ActiveSheet.Shapes("Button 20").Select
Selection.Characters.Text = "SHOW LEADS"
Range("A1").Select
End Sub

These macros change the label fine after hiding or unhding the rows but I can't find the proper terms to use to change the macro associated with the button (if there is one?)