class Tab1 : public WithTab1Layout<TopWindow> {
public:

	typedef Tab1 CLASSNAME;

	Tab1();
	void AddPlayer(); //callback from Add_Player  button
	void ModifyPlayer(); //callback from Modify_Player  button
	void MaskDefaultValue(); //callback from Clear button
	void FillFieldsFromRow();
};

void Tab1::ModifyPlayer() // body of the callback 
{   int int_row;
    int_row=arr.GetCursor();
    if (int_row < 0) return; // prevent the crash of the application when int_row = -1)
    if ( (~editName) == Null) { //of course this is specific of my application... in principle this if() block can be removed
       Exclamation("The Name field cannot be empty!");
       return;
    }
	arr.Set( int_row, 0, ~editName);
	arr.Set( int_row, 1, ~editCountry);
	arr.Set( int_row, 2, ~editBirth);
	arr.Set( int_row, 3, ~tsex);
	arr.Set( int_row, 4, ~editTitle);
	arr.Set( int_row, 5, ~editFIDEId);
	arr.Set( int_row, 6, ~editFIDERat);
	arr.Set( int_row, 7, ~editNatId);
	arr.Set( int_row, 8, ~editNatRat);
	arr.Set( int_row, 9, ~kcoeff);
	
	ActiveFocus(editName);
	MaskDefaultValue();
}