Several variable on dialog box

### Issue type

**I'm submitting a ...** (check one with "x")

* [x] bug report
* [ ] feature request

### Issue description

**Current behavior:**

Can't use several variable to my dialog box.
I have create 2 @input !

**Expected behavior:**

**Steps to reproduce:**

Create a dialog box with 2 `@input (varA, varB); console.log(varB)`,
Call dialog box `context:{varA : 1, varB: 2};`
Open console : varB undefined

**Related code:**

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### Other information:

**npm, node, OS, Browser**
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**Angular, Nebular**
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