Update FormControl.md

Author: bietkul

docs/api/FormControl.md

@@ -106,6 +106,16 @@ console.log(this.control.status);  // 'DISABLED'
 ```
 ##
 ```ts
+active: boolean;
+```
+`true` means control is in `focused` state.
+##
+```ts
+inactive: boolean;
+```
+`true` means control is in `unfocused` state.
+##
+```ts
 onChange: (value: any) => void;
 ```
 Function needs to be called whenever a value change happens.
@@ -116,6 +126,11 @@ onBlur: () => void;
 Function needs to be called whenever a blur event triggers.
 ##
 ```ts
+onFocus: (e: any) => void;
+```
+Function needs to be called whenever a focus event triggers.
+##
+```ts
 onValueChanges: Observable<any>;
 ```
 Emits an event every time the value of the control changes, in the UI by onChange event.
@@ -196,6 +211,11 @@ onBlur: (e: any) => void;
 Function needs to be called whenever a `blur` event triggers.
 ##
 ```ts
+onFocus: (e: any) => void;
+```
+Function needs to be called whenever a `focus` event triggers.
+##
+```ts
 disabled: boolean;
 ```
 Tells the input element about the `disabled` status.