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We face some issues.

1.While loading the grid  in web page the data was hidden some times.Once click  on the header only the data will be populated in the screen.

1.Such problem can occur only if you loaded data in grid while it in invisible state, or in case of loading complex TABLE layout and initializing grid in moment when table was not fully rendered yet - in both cases grid can't detect initial sizes and render correctly.

You can:

a) call grid.setSizes() after switching to visible state;

b) init grid after TABLE structure was fully rendered (place JS code after closing TABLE tag) or init grid from onLoad event of page.

 
2. There is no such thing as "combobox" in normal HTML.

The existing exCell doesn't provide the multiselect control (it can be easily maid as separate - I can send a sample, if necessary) but grid has "clist" excell which can be used as multi-select control.

If you haven't found the needed information there and still looking for a solution, you will find the additional help checking load combobox and nhc toolbar.