Remove mask from the Grid (ExtJS)

I created a grid using ExtJs framework. When the grid was loading , the 'loading...'  text was displayed in
the screen. The text was displayed by Extjs framework , and I needed to remove it. In order to do it,
I debuged ExtJs framework and found out that the message was created by the
LoadMask class. In order to remove the loading message need to define in the class config setup of the grid,  viewConfig section with the 'loadMask:false' option.
viewConfig: {
  loadMask:
 false
}