Thanks Sergey. This works. Question: I inadvertently clicked on Help instead of Solution; I cannot re-mark your reply as a solution.

>Try to add

      Column2.Width = 1, ;
>

>>Hi all, This is a problem (bug?) that exists in VFP8 and fixed in VFP9. The problem is that, column C3's tooltip shows C2's tooltip, which is hidden, when you hover the mouse over it. Is there a workaround for this problem in VFP8?
>>

>>oform = createobject('form1')
>>oform.show(1)
>>define class form1 as form
>>   showtips = .t.
>>   caption = "Form1"
>>   name = "Form1"
>>   add object grid1 as grid with ;
>>      columncount = 4, ;
>>      height = 216, ;
>>      left = 12, ;
>>      top = 12, ;
>>      width = 348, ;
>>      name = "Grid1", ;
>>      Column1.name = "Column1", ;
>>      Column2.visible = .f., ;
>>      Column2.name = "Column2", ;
>>      Column3.name = "Column3", ;
>>      Column4.name = "Column4"
>>   procedure load
>>      create cursor test (f1 i, f2 i, f3 i, f4 i)
>>      insert into test values (1,2,3,4)
>>   endproc
>>   procedure init()
>>      with this.grid1.Column1.header1
>>         .caption = "C1"
>>         .tooltiptext = "C1"
>>      endwith
>>      with this.grid1.Column2.header1
>>         .caption = "C2"
>>         .tooltiptext = "C2"
>>      endwith
>>      with this.grid1.Column3.header1
>>         .caption = "C3"
>>         .tooltiptext = "C3"
>>      endwith
>>      with this.grid1.Column4.header1
>>         .caption = "C4"
>>         .tooltiptext = "C4"
>>      endwith
>>   endproc
>>enddefine
>>