Hi!

Then, you can remove comboboxes before you change the grid columns. Something like

for i=1 to grid.ColumnCount
  if eval("Grid.Columns(i)." + Grid.Columns(i).CurrentControl+ ".BaseClass") == "ComboBox"
    with eval("Grid.Columns(i)." + Grid.Columns(i).CurrentControl
      .Visible = .F.
    endwith
    Grid.Columns(i).RemoveObject(Grid.Columns(i).CurrentControl)
  endif
endfor

BTW, just an idea - did you tried to set the Visible = .F. for grid for the moment when you change its columns? Try this simple idea and let us know if it helped.

>I don't want to change grid recordsource. I want only to add new columns to grid. Currently I use the below. I read your article but haven't found any hind how to change this code.
>I found that C5 error occurs ONLY if grid contains combobox. If grid contians only textboxes, c5 error does't occur.
>
>

>* Form ChangeGridLayout() method.
>this.MousePointer = 11
>_screen.mousepointer = 11
>this.cmdFormSwitch1.setfocus()
>this.gridbase1.columncount = 0
>this.cmdFormSwitch1.FindNextLayout(thisform.brtabel)
>this.gridbase1.Init()
>this.gridbase1.setfocus()
>this.mousepointer = 0
>_screen.mousepointer = 0
>

>
>>Hi!
>>
>>Use the grid reconstruction behaviour ;)
>>Tr following code and let us know if it works:
>>
>>

>>* close old alias
>>select (Grid.RecordSource)
>>use
>>* here grid lose all its columns
>>Grid.ColumnCount = -1
>>Grid.RecordSource = "NewAlias"
>>Grid.Refresh
>>

>>
>>More about grid reconstruction you can read in the VFP Grids article in the UT magazine, August issue.
>>
>>HTH.
>>
>>
>>>I have a command F3 "change grid form" in my form.
>>>This command destroys all grid columns and then adds new columns to grid.
>>>
>>>To destroy columns I use
>>>
>>>

>>>  this.gridbase1.columncount = 0  && C5 error occurs in this line
>>>

>>>
>>>I tried also
>>>
>>>

>>>  DO WHILE this.gridbase1.columncount>0
>>>    this.gridbase1.DeleteColumn   &&& C5 error occurs in this line
>>>    ENDDO
>>>

>>>
>>>Using those commands in VFP 7 will cause C5 error sometimes. This works in VFP 5.
>>>
>>>Is there a way to re-create grid columns to avoid C5 error ?