Dragan, here what I do for testing (not works very well but have no time for adjustments :o))))

Add a property in Your Container Class i.e. FontBold. In Init Event of the container Class:

*** Init
IF PEMSTATUS(this.Parent.Parent,"AfterRowColChange",5)
   BINDEVENT(this.Parent.Parent,"AfterRowColChange", this, "AfterChange",[flags here])
ENDIF

*** AfterChange Method of the Container
LPARAMETERS nColIndex

IF .NOT. EMPTY(this.FontBold) .AND. TYPE(this.FontBold) == "L"
   this.Text1.FontBold = EVALUATE(this.FontBold)
ENDIF

*** Detsroy of the Container

UNBINDEVENTS(this.Parent.Parent)


*** In init Event of the form / Grid
This.Grid1.ColumnWithContainer.SetAll("FontBold","YourConditionHere","ContainerClassName")

Smething like that.