Host Items

Excel has three kinds of host items, and their behaviors differ. Only worksheet host items can contain host controls. You cannot add a host control to a workbook or a chartsheet. The workbook acts as a component tray for components that you want to make available to all worksheets in the workbook. Each worksheet also has its own component tray, but the worksheet itself can contain host controls (or Windows Forms controls). Chartsheets are also considered host items, but they cannot contain any type of control.

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