Hello Manish Kumar,
1.You should edit the CornerRadius property of the (1)"PART_IndicatorPresenter"
and the CornerRadius of the (2)"NavigatorIndicatorBackground" to achieve desired result.
Look at your style and replace the CornerRadius with CornerRadius="6,6,6,6" for (1) and (2).
2.In order to change background color of the GridViewHeaderRow you should edit the template and edit the brush used to paint HeaderBackground.
3.You can change the width and height of the GridView
by setting its Width and Height properties.
All the best,
the Telerik team
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