Bug 93245 [Dialogs] Error messages show up in two locations in the properties dialog
Force an error message: 1) select a Java project 2) open the properties dialog 3) navigate to Java Compiler>Building 4) enable project specific settings 5) enter a letter into the maximum number of problems field ->the error message shows up at the bottom 6) resize the dialog ->the error message also shows up in the banner
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
Control[] children = pageContainer.getChildren();
		Control currentControl = currentPage.getControl();
		for (int i = 0; i < children.length; i++) {
			if (children[i] != currentControl)
				children[i].setVisible(false);
		}
		
		currentPage.setVisible(true);
		if (oldPage != null)
			oldPage.setVisible(false);
		
		update();
		return true;
	}
	/**
	 * Create the page for the node.
	 * @param node
	 * 
	 * @since 3.1
	 */
	protected void createPage(IPreferenceNode node) {
		node.createPage();
	}
	/**
	 * Get the page for the node.
	 * @param node
	 * @return IPreferencePage
	 * 
	 * @since 3.1