Hi Wajeed,
What you are referring to as a bootstrap grid is known a Bootstrap Table and it is build out of pure HTML5 + jQuery + CSS. The only way you can use a Bootstrap Table with uniGui is by loading the required Bootstrap code into a uniHTMLFrame or uniURLFrame. No other uniGui components can take part (as far as I know). However with only these 2 components the possibilities of what you can do with uniGui + Bootstrap are endless, including building applications that will work equally well on any device.
If you are interested I can put together a simple uniGui + Bootstrap grid for you to look at.