添加到选项卡的打印预览控件未刷新

我需要将打印预览控件添加到选项卡，在第一个表上将有一个富文本框，而我使用的是我们论坛建议的扩展的富文本框控件，在另一个选项卡中是打印预览控制.当我切换选项卡以查看预览时，应在该预览选项卡中预览在富文本框中键入的文本内容.

我使用了一个打印文档，该文档将用于打印富文本.用户单击选项卡时，文本框内容和打印文档将用于打印预览控制.

我遇到一个问题，当我在富文本框中输入内容并第一次移动到预览选项卡时，将内容打印在预览控件上，当我返回上一个选项卡并进行一些修改时，返回预览，现在内容不刷新.我无法获得所做的更改.第二次.

任何帮助都会有所帮助.

I have a requirement to add print preview control to a tab, on first table there'll be a rich text box and I am using the extended rich text box control which is suggested by our forum, in another tab the print preview control. As and when I switch the tab to see the preview the text content typed in rich text box should be previewed in that preview tab.

I have used a print document to which will be used for printing the rich text box contents and the print document will then be used for print preview control when the user clicks the tab.

I am facing a problem where when I enter contents to rich text box and first time move to preview tab the contents are printed on the preview control, when I come back to previous tab and do some modification and go back to preview, now the contents are not refreshed. I am not able to get the changes that I've made  second time.

Any help would be helpful.