clears the existing grid state and loads data from an external file ( xml, json, jsarray, csv )
| url | string | url to an external file | 
| call | function | after loading callback function, optional | 
| type | string | type of data (xml,csv,json,jsarray), optional, XML by default | 
//clear grid and load new data
myGrid.clearAndLoad("grid_new.xml");
//clear grid, load new data, execute doAfterRefresh() function after grid was loaded
myGrid.clearAndLoad("grid_new.xml",doAfterRefresh);
//clear grid, load new data in csv format, execute doAfterRefresh() function after grid was loaded
myGrid.clearAndLoad("grid_new.csv",doAfterRefresh,csv);
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