FindText dialog disapears when click outside it, it goes back of application

I show my report in my wpf application like this:

report.Load(@"D:\ListReport.frx");

       report.Preview = prew;

      report.Prepare();

      report.ShowPrepared();

      windowsFormHost2.Child = prew;


everything is ok except when I click on findText button on toolbar, it apears but when I click outside it it goes behind the whole app

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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.