Slide in object onclick

My goal is to get a panel to slide in with easing when I click a button.

Solution attempt #1: I tried using the Action Wizard to change the position of the panel:

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.myTermConditionsBtn.on('click', function(){
/*
Moves the specified symbol instance up or down by decreasing or increasing its y property by the specified number of pixels.
To move the instance up input a negative number.
*/
	_this.termsConditionsPanel.y-=140;
});
var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.termsConditionsPanel.on('click', function(){
/*
Moves the specified symbol instance up or down by decreasing or increasing its y property by the specified number of pixels.
To move the instance up input a negative number.
*/
	_this.termsConditionsPanel.y+=140;
});

Issue with Solution 1: This works well without affecting the main animation, but I have not been able to figure out how to add easing/smooth transition. It starts off canvas, I click the button and then it jumps into place.

Solution attempt #2: I've tried stopping the main animation and adding the slide-in animation at the end of the timeline:

/* stop main animation */
this.stop();

var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.myTermConditionsBtn.on('click', function(){
	/*
	Moves the playhead to the specified frame label in the timeline and continues playback from that frame.
	Can be used on the main timeline or on movie clip timelines.
	*/
	_this.gotoAndPlay('slidePanelOpen');
});


var _this = this;
/*
Clicking on the specified symbol instance executes a function.
*/
_this.termsConditionsPanel.on('click', function(){
	/*
	Moves the playhead to the specified frame label in the timeline and continues playback from that frame.
	Can be used on the main timeline or on movie clip timelines.
	*/
	_this.gotoAndPlay('slidePanelClose');
});*/

Issue with solution #2: When I click the button, the animation works by jumping to a particular frame where I've added the slide in animation. The trouble with this solution is that if I click the button during the main animation, it will skip the rest of the main animation and jump to the frame with the slide in animation. I really don't want to skip the main animation.

Any suggestions of a solution how to add a slide-in panel with easing without affecting the main animation?