Change block size by linear dimension or fix dimension line to blcok

[spufut]

Hello! I am new to Dynamic Blocks so this could sounds like a noob question. 

I created this block(see picture) and I want to lock dimensions to it. Is there a way to constrain the dimension line to the block so after i change block parameters, the dim line changes it's value to the new one?

Or could i change the block parameters by dim line?

Thank you! 

[hwalker]

Add the dimension to the stretch parameter and when you change the parameter the dimension will change

[j.palmeL29YX]

A dimension can not drive the block parameter. 

But :

>>Video<<

[spufut]

Hi! Thank you so much for the video. I think i do something wrong.

First, I choose the "Linear Parameters" (first picture). Secondly, from Annotate panel -> Dimension. (Second picture). After that, from "Actions" --> Stretch.(3rd pic) Is this the right way? Because after i did this, i can t stretch the rectangle. Did you use any other constraints? Or could you upload the model if you didn t delet it?:))

Thank you and sorry for wasting your time.

[j.palmeL29YX · Accepted solution]

I see you have added some geometrical costraints (perpendicular).
So I'm afraid, you may also have added dimensional constraint(s). In my video d1. (Because you can disable the visibility of such dimensional constraints I'm not sure if you did. Posting your dwg file would avoid a lot of questions)
If you now add a linear parameter and try to stretch the geometry, that will not work, becase d1 fixes the dimension of the geometry.

A first solution:
Delete all constraints, then it will work as expected.

>>Video_complete<<        [EDIT]: incomplete video substituted by new version.

A second possibility: If you urgently want or need (I would not know why you should) , you can drive the geometry using constraints. Only using constraints (geometric and dimensional), not mixed with dynamic parameters and actions. If so let me know, I will show you how to do that.