This sounds like a bug. When Column.Sparse=.F. we will not be able to programmatically control the cursor position in an Editbox of a column.

Push Key Clear
On Key Label F5 _Screen.ActiveForm.Grid1.Column1.Editbox1.SelStart=3
o=NewObject("form1")
o.Show(1)
Pop Key

Define Class form1 As Form
	Width=500
	Height=300
	Add Object Grid1 As MyGrid
	Add Object Checkbox1 As Checkbox With Top=210, Caption='Sparse', Value=.T.
	Add Object Label1 As Label With AutoSize=.T.,Top=230;
		, Caption='Push F5 to run "_Screen.ActiveForm.Grid1.Column1.Editbox1.SelStart=3"'

	Procedure Load
	Create Cursor Test (f1 m)
	Insert Into Test Values ('Text Line 1')
	Insert Into Test Values ('Text Line 2')
	Go Top

	Function Checkbox1.InteractiveChange
	Thisform.Grid1.Column1.Sparse=This.Value
	Thisform.Grid1.Column1.SetFocus
EndDefine

Define Class MyGrid As Grid
	Height = 200
	RowHeight = 60
	Add Object Column1 As EditColumn
EndDefine

Define Class EditColumn As Column
	Add Object Header1 As Header
	Add Object Editbox1 As EditBox
EndDefine

Ben