Daniel,

>
>I try use a picturebox in my mdiparent when i show mdichild , show back on the picturebox how I do for to mdi child show front on teh picture box, I try with this
>
>MyChildForm.SendToBack()

In addition to what Viv said you may have to hide the picturebox when you show a form and then show it again when the form is closed. I don't think you can get the picture box to be behind any forms this way.
Tim