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I can change the height of the grid content,I don't know how to change the height of grid's header,ths.
Hi cyril sun,
As per my understanding; the header size is based on the text inside the header. Try increasing the text size in DefaultGridHeaderStyle Style Definition to change the height if you want to make changes for all Grids. Or create your own custom Style for GridHeaderStyle property of Grid in Mashup if you want to make changes in just one Grid.
I hope it helps.