Bug 199021 Error message pops up several times when click an invalid dataset
Description: There is a sqlserver datasource and dataset, remove the jtds driver to let the dataset invalid. Double click on the dataset, the error message will pop up serveral times. Build version:2.2.0.v20070807-0630 Steps to reproduce: 1. Create a sqlserver datasource and dataset. 2. Remove the jtds driver, and the dataset will be invalid. 3. Double click on the dataset. Expect result: Error message pops up once to indicate the problem. Actual result: Error message pops up serveral times.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
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	/**
	 * Sets Splitter Weights.
	 * if left side is too wide,set weights with default value 40,60.  
	 * @param splitter
	 */
	private void setSashFormWeights( SashForm sashForm )
	{
		int leftWidth = sashForm.getChildren( )[0].computeSize( SWT.DEFAULT,
				SWT.DEFAULT ).x;
		int totalWidth = sashForm.computeSize( SWT.DEFAULT, SWT.DEFAULT ).x;
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		{
			
			sashForm.setWeights( new int[]{
					40, 60
			} );
		}
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		{
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					leftWidth, totalWidth - leftWidth
			} );
		}
	}
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