>Can I remove all object without knowing the object name? Like removeall images :)

No, but if you want to remove ALL images:

DIMENSION aImage[1]
LOCAL lnFor, lnImage
lnImage = 0
FOR lnFor = 1 TO thisform.ControlCount
    IF UPPER(thisform.Controls(lnFor).BaseClass) == [IMAGE]
       lnImage = lnImage + 1
       DIMENSION aImage[lnImage]
       aImage[lnImage] = thisform.Controls(lnFor).Name
    ENDIF
NEXT
FOR lnFor = 1 TO lnImage
    thisform.RemoveObject(aImage[lnImage])
NEXT

not tested
Also this will remove only images which is placed directly on the form, not if you have them in some container classes.