Hello All
From where can i fine the tpl files for the invlice module in SuiteCRM.
I want to add one button on it.
When any one click on button the popup will open same as when i click on calendar grid.
and i want to save recurrance of invoice in database.
please help me to develop this functionality.
AND I WELCOME ANY SUGGESTION REGARDING THIS.
MANY THANSK. 
You wouldn’t do this in the tpl file you would do it in the custom editviewdefs by either adding a button to the buttons array for a button at the top of the page. Or if you want the button else where you would create a customCode field and add it there. Look in the editviewdefs of other modules for examples. You will also need to know how to add JavaScript to get the pop-up to work.