The problem with the function scope object

Thank you all for the advice !

function myclassA()
{
	this.A = 1;
	this.TimerID = null;
}

myclassA.prototype.func_1 = function()
{
	/* here some code */
	this.TimerID = setInterval(this.func_2.bind(this), 50);
}

myclassA.prototype.func_2 = function()
{
	/* There was an error ! )) */
}

function myclassB(_object)
{
	this.B = 1;
	this.Obj = _object;
}

myclassB.prototype.func_1 = function()
{
	/* here some code */
	this.Obj.func_1();
}