Bug 90569 combobox needs to remember more items
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchPage.java
fPreviousSearchPatterns.add(0, match); 
		return match;
	}
	/*
	 * Implements method from IDialogPage
	 */
	public void setVisible(boolean visible) {
		if (visible && fPattern != null) {
			if (fFirstTime) {
				fFirstTime= false;
				
				fPattern.setItems(getPreviousSearchPatterns());
				initSelections();
			}
			fPattern.setFocus();
		}
		updateOKStatus();
		super.setVisible(visible);
	}
	
	public boolean isValid() {
		return true;
	}
	
	/**
	 * Creates the page's content.
	 */
	public void createControl(Composite parent) {
		initializeDialogUnits(parent);
		readConfiguration();