[VKS]

Ext.override(Ext.grid.GridView, {
	rowOverCls: 'x-grid3-row-over',
	colOverCls: 'x-grid3-cell-over',
	hdOverCls: 'x-grid3-hd-over',
	onRowOver: function(e, t){
		if(this.rowOverCls){
			var row = this.findRowIndex(t);
			if(row === false){
				row = undefined;
			}
			if(this.currentRow !== row){
				if(this.currentRow !== undefined){
					this.removeRowClass(this.currentRow, this.rowOverCls);
				}
				this.currentRow = row;
				if(row !== undefined){
					this.addRowClass(row, this.rowOverCls);
				}
			}
		}
		if(this.colOverCls || this.hdOverCls){
			var col = this.findCellIndex(t);
			if(col === false){
				col = undefined;
			}
			if(this.currentCol !== col){
				if(this.currentCol !== undefined){
					if(this.hdOverCls){
						this.removeHdClass(this.currentCol, this.hdOverCls);
					}
					if(this.colOverCls){
						this.removeColClass(this.currentCol, this.colOverCls);
					}
				}
				this.currentCol = col;
				if(col !== undefined){
					if(this.hdOverCls){
						this.addHdClass(this.currentCol, this.hdOverCls);
					}
					if(this.colOverCls){
						this.addColClass(this.currentCol, this.colOverCls);
					}
				}
			}
		}
	},
	onRowOut: function(e, t){
		if(this.rowOverCls && (this.currentRow !== undefined)){
			this.removeRowClass(this.currentRow, this.rowOverCls);
			delete this.currentRow;
		}
		if((this.colOverCls || this.hdOverCls) && (this.currentCol !== undefined)){
			if(this.hdOverCls){
				this.removeHdClass(this.currentCol, this.hdOverCls);
			}
			if(this.colOverCls){
				this.removeColClass(this.currentCol, this.colOverCls);
			}
			delete this.currentCol;
		}
	},
	addHdClass: function(col, cls){
		Ext.fly(this.getHeaderCell(col)).addClass(cls);
	},
	removeHdClass: function(col, cls){
		Ext.fly(this.getHeaderCell(col)).removeClass(cls);
	},
	addColClass: function(col, cls){
		var rows = this.getRows();
		for(var r = 0, len = rows.length; r < len; r++){
			Ext.fly(Ext.fly(rows[r]).query(this.cellSelector)[col]).addClass(cls);
		}
	},
	removeColClass: function(col, cls){
		var rows = this.getRows();
		for(var r = 0, len = rows.length; r < len; r++){
			Ext.fly(Ext.fly(rows[r]).query(this.cellSelector)[col]).removeClass(cls);
		}
	}
});

CSS

.x-grid3-cell-over {background:#efefef;}
.x-grid3-row-over .x-grid3-cell-over {background:#b8cfee;}