Bug 140576 [JFace] dialog has no icon or clipped error icon
1) for a Java Project select 'Configure Build Path' in context menu and goto tab 'Libraries' 2) edit Access Rules for a library (e.g. JRE System...) 3) see that the dialog and its children have no window icon
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/StatusDialog.java
return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_ERROR);
			} else if (status.matches(IStatus.WARNING)) {
				return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_WARNING);
			} else if (status.matches(IStatus.INFO)) {
				return JFaceResources.getImage(Dialog.DLG_IMG_MESSAGE_INFO);
			}
			return null;
		}
		/**
		 * Sets the message and image to the given status. 
		 * @param status IStatus or <code>null</code>.
		 * <code>null</code> will set the empty text and no image.
		 */
		public void setErrorStatus(IStatus status) {
			if (status != null && !status.isOK()) {
				String message = status.getMessage();
				if (message != null && message.length() > 0) {
					setText(message);
					StatusDialog.this.setImage(findImage(status));
					setBackground(JFaceColors.getErrorBackground(getDisplay()));
					return;
				}
			}
			setText(""); 	
			StatusDialog.this.setImage(null);
			setBackground(fNormalMsgAreaBackground);
		}
	}
	/**
	 * Creates an instance of a status dialog.