To know how to handle storyboads sequntially using expression blend

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C#

expression

Blend

I’m new to the expression blend and im very much interested in learning it. I have implement a scenario using expression blend which allows user to click on button 1 then the storyboard 1 will be executed.Afterthat when the user clicks on the button2, storyboard2 will be executed. But in the way I have implemeted, if the user clicks on button 2 initailly storyboard2 will be executed. I want to make it change like, if he clicks on button2 first nothing should happen.I want to allow the user to click on button 1 first and after that button2. If the user clicks on button2 first instead of button1 nothing should be happen.I would be thankfull to you if you give me a hint about how to do it.