Bug 102436 Date/time value not stored correctly in report design
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
format += ":" + formatPattern; 
			}
			inputParameter.setFormat( format );
			if ( isStatic( )
					&& ( PARAM_CONTROL_COMBO.equals( getSelectedControlType( ) ) || DesignChoiceConstants.PARAM_CONTROL_RADIO_BUTTON.equals( getSelectedControlType( ) ) )
					&& !containValue( null, defaultValue, COLUMN_VALUE ) )
			{
				defaultValue = null;
			}
			
			if ( dirtyProperties.containsKey( CHECKBOX_HIDDEN ) )
			{
				inputParameter.setHidden( getProperty( CHECKBOX_HIDDEN ) );
			}
			if ( PARAM_CONTROL_LIST.equals( getSelectedControlType( ) )
					|| DesignChoiceConstants.PARAM_CONTROL_TEXT_BOX.equals( getSelectedControlType( ) ) )
			{
				if ( dirtyProperties.containsKey( CHECKBOX_ALLOW_BLANK ) )
				{
					inputParameter.setAllowBlank( getProperty( CHECKBOX_ALLOW_BLANK ) );
				}
				if ( dirtyProperties.containsKey( CHECKBOX_ALLOW_NULL ) )
				{
					inputParameter.setAllowNull( getProperty( CHECKBOX_ALLOW_NULL ) );
				}
			}
			else
			{
				inputParameter.setProperty( ScalarParameterHandle.ALLOW_BLANK_PROP,
						null );