Bug 19145 [Wizards] Make wizards resizable and keep bounds
Both the Checkbox Tree and the Checkbox List have horizontal scrollbars because mose package names and type names don't fit in the default size. It would be nice to be able to size this dialog bigger, and have it have a wider default size (I assume it is sized for 640x480? but is could be wider).
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
if (getErrorMessage() != null)
				setErrorMessage(null);
			return false;
		}
		if (fExportClassFilesCheckbox.getSelection() || !fExportJavaFilesCheckbox.getSelection())
			return true;
			
		
		Iterator iter= getSelectedResourcesIterator();
		while (iter.hasNext()) {
			if (!(iter.next() instanceof IClassFile))
				return true;
		}
		if (getErrorMessage() != null)
			setErrorMessage(null);
		return false;
	}
	/*
	 * Overwrides method from WizardExportPage
	 */
	protected IPath getResourcePath() {
		return getPathFromText(fSourceNameField);
	}
	/**
	 * Creates a file resource handle for the file with the given workspace path.
	 * This method does not create the file resource; this is the responsibility
	 * of <code>createFile</code>.
	 *
	 * @param filePath the path of the file resource to create a handle for
	 * @return the new file resource handle