https://www.programcreek.com/java-api-examples/org.eclipse.swt.custom.ScrolledComposite
https://o7planning.org/en/11119/java-swt
https://o7planning.org/en/11295/java-swt-sashform-tutorial
http://help.eclipse.org/kepler/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fapi%2Forg%2Feclipse%2Fswt%2Fcustom%2FSashForm.html
https://www.ibm.com/developerworks/cn/linux/opensource/os-ecgui1/
http://www.blogjava.net/jackgogogo/archive/2007/10/30/156841.html
对滚动条支持不好.虽然比c#快, 但是难用.