Create a call Back to button control in Ribbon

[C# Programming]

Hello all,

I want to create an Word add-In in Visual studio. I used word Add-In feature for the same, Now i added the ribbon file to it which has a new tab and a button control. I would like to show message on click of this button control. I read the full article about this in MSDN, and did following
steps:
Exported the ribbon to xml
Wrote the OnAction attribute to the button control in xml

But still it's not working.
I wrote the following code in Ribbon1.cs:

private void button1_Click(object sender, RibbonControlEventArgs e)
{
MessageBox.Show("Hello");
}

Tell me how to call this method ? how to write the same in Ribbon call Back region......??? http://www.barakasoft.com/script/Forums/Images/smiley_sniff.gif