In normal ASP textbox width in percentage from css is working and also we can only an input is rendering. But when we use Telerik Custom control we can see a span is renderin first then inside that span textbox is rendering. So that this span automatically setting 160px width so if we put width:50% the text box will take 50% of this Span ie 80px.
But in other case it will calculate the td width and set the 50% of that td width.
But in other case it will calculate the td width and set the 50% of that td width.