RadStrip style changes unexpectedly on reload

[shaji kunjumon]

 

I have a telerik radstrip with two radtabs on my page which is linked to a radmultipage with two pages and the each of the pages have a radgrid on it. I hide/show the radstrip on a button click.

sometimes the radtab style changes unexpectedly and showing it as bulleted rather than tabs as in attached image.

when the page loads first time I do not show the tab. Clicking on the button shows the tab and it is showing up properly as in attached image 1. Then I hide the tab by clicking the button again and make some drop down selection and then click the button again to show the tab. This time my selection causes the grids on the tab to show some data. But now the tab style is changed unexpectedly as in attached image 2.

please help.