code: private void cmdExecuteActionPerformed(java.awt.event.ActionEvent evt) {
  		if (selectedSource == null) {
  			DialogUtils.showQuickErrorDialog(this, new Exception("Data source has not been defined."));
  		}
  		else {
  			String sqlString = txtQueryEditor.getText();
  			if (sqlString.isEmpty()) {
  
  				JOptionPane.showMessageDialog(this, "SQL query cannot be blank", "Warning", JOptionPane.WARNING_MESSAGE);
  			}
  			else
  			{
  				executeQuery();
  				txtClassUriTemplate.requestFocus();
  			}
  		}
  
  	}
docs: GEN-LAST:event_txtRowCountKeyPressed