Bug 180645 Support set format for Date/Time type parameter.[0705]
Description: Support set format for Date/Time type parameter. Build number:2.2.0.v200704031345 Steps to reproduce: 1. New a Date report parameter. 2. Click Change... button to set format for it. Expected result: Can set format for Date/Time parameter. Actual result: Change... button is disabled. Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/FormatDateTimePage.java
public String getPattern( )
	{
		return pattern;
	}
	/**
	 * Returns the category from the page.
	 */
	public String getCategory( )
	{
		return category;
	}
	/**
	 * Returns the formatString from the page.
	 */
	public String getFormatString( )
	{
		if ( category == null && pattern == null )
		{
			return DesignChoiceConstants.DATETIEM_FORMAT_TYPE_UNFORMATTED;
		}
		if ( category == null )
		{
			category = ""; 
		}
		if ( pattern == null )
		{
			pattern = ""; 
		}
		if ( category.equals( pattern ) )
		{