Progressbar issue when generating excel report

Question

 Hi everybody,

i am getting an issue with the progress bar while using it with generating excel report...

what exactly i am trying to acheive is :- I am trying to generate an excel report on click of a button and as the report generation takes a lot of time i want a progress bar until the excel is generated

PROBLEM :- the progress bar shows up when the button is clicked but it doesnt hides/disables after the excel download is prompt to the user. The progress bar is still there...

Can anyone help me in this issue.