How can I assign a function to a command button placed in Excel 2007 Worksheet?

I need to use Goal Seek command (from Excel Menu/Data/What-If Analysis/Goal
Seek) in my worksheet to do some calculation. However instead of following
the
menu path, I want to place a button in my worksheet and assign the Goal seek
command to this button. By clicking on this button, the dialogue for Goal
Seek function should appear.