1. A method comprising: detecting, by a user device, an input on a display device associated with the user device; determining, by the user device, a gesture corresponding to the input detected on the display device; and performing, by the user device, an operation when the gesture corresponds to a particular gesture, performing the operation including: navigating between a first child content and a second child content based on the particular gesture, the first child content being accessible via a first parent content that is associated with a first plurality of content, the first child content including a portion of the first plurality of content, the first parent content including a first e-mail account and the first child content corresponding to an e-mail message of the first e-mail account, the second child content being accessible via a second parent content that is associated with a second plurality of content, the second parent content being different than the first parent content, the second child content including a portion of the second plurality of content, the second parent content including a second e-mail account that is different than the first e-mail account, the second child content corresponding to an e-mail message of the second e-mail account, and navigating between the first child content and the second child content including: navigating between the e-mail message of the first e-mail account and the e-mail message of the second e-mail account.