Selecting a grid row: In transaction IW37N I want to select a report variant. The variant list is implemented as a grid control by SAP. Is there a way to select a row in the grid control?
The grid control cannot be manipulated directly by GuiXT means. As a workaround you can call up SAP GUI scripting from your GuiXT script or InputScript (keywords: ApplyGUIScript or with the "GuiXT Controls" component, CallVBS or CallVB).

For starting an ABAP report with a particular variant you may also use the transaction START_REPORT where you can enter the report name and the variant.