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
minimumPageSize.y = size.y;
	}
	/**
	 * Sets the preference store for this preference dialog.
	 * 
	 * @param store
	 *            the preference store
	 * @see #getPreferenceStore
	 */
	public void setPreferenceStore(IPreferenceStore store) {
		Assert.isNotNull(store);
		preferenceStore = store;
	}
	/**
	 * Save the currently selected node.
	 */
	private void setSelectedNode() {
		String storeValue = null;
		IStructuredSelection selection = (IStructuredSelection) getTreeViewer().getSelection();
		if (selection.size() == 1) {
			IPreferenceNode node = (IPreferenceNode) selection.getFirstElement();
			storeValue = node.getId();
		}
		setSelectedNodePreference(storeValue);
	}
	/**
	 * Sets the name of the selected item preference. Public equivalent to
	 * <code>setSelectedNodePreference</code>.
	 * 
	 * @param pageId